The conditions failing to meet retention standards will be listed on the DA 3947 and in the NARSUM.
You don't have a "say," strictly speaking- it is the determination of the MEB that matters. However, if they fail to properly evaluate your case, you should ask for an impartial independent review of the case. This will trigger a review by a provider not on the MEB (often, your PCM), who will either concur with the MEB or disagree. It is pretty rare to get a disagreement, but the important thing is that by requesting the review, it triggers an obligation for the MEB approving authority to respond in writing to your written submissions. This also rarely results in changes- if it does, then great, you have won that "battle"- but it does two important things. 1) It gets your views, which otherwise would not be available, before the IPEB. This will increase your chances of a good early outcome from the IPEB. 2) It makes clear that you disagreed, which in some cases is an important issue in later appeals.